problem1. How is our atmosphere dissimilar from the atmospheres on Venus and Mars?

problem2. How does the atmosphere act as a blanket?

problem3. What causes winds?

problem4. How are clouds formed?

problem5. List out any three human activities that you think would lead to air pollution.

problem6. Why do organisms require water?

problem7. What is the chief source of fresh water in city/town/village where you live?

problem8. Do you know of any activity which might be polluting this water source?

problem9. How is soil formed?

problem10. prepare down a brief note on soil erosion?

problem11. What are the methods of preventing or reducing soil erosion?

problem12. What are the different states in which water is found throughout the water cycle?

problem13. Name two biologically significant compounds that hold both oxygen and nitrogen.

problem14. List out any three human activities which would lead to a raise in the carbon dioxide content of air?